Posts: 668
Threads: 144
Joined: Jun 2011
City: Elko,MN.
Want to re-cap the bakelite blocks on a 630 chassis.
As far as I can tell from the schematics, it should have 2 blocks.
THe first one I removed is labeled (I believe) 8378 su.
Has a single cap inside, whereas the schematics say it has two .015 caps.
What gives?
I have .010 and .020 caps.
Should I default higher or lower?
Thanks,
murf
(This post was last modified: 11-09-2013, 10:19 AM by
murf.)
Posts: 290
Threads: 54
Joined: Mar 2007
City: Toledo
State, Province, Country: OH
murf, I sent you a PM on the other site. Anyway, I don't think that 8378 is a good number. Probably 8328 which is a single .03 capacitor.
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
If you are looking at the 2 (each) .015 caps that go across the AC line, they must be safety caps (X1 - Y2 or X2 - Y2). And you are probably going to find .01 replacements.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 668
Threads: 144
Joined: Jun 2011
City: Elko,MN.
Well guy's, It looks to me like someone added a block down at the bottom or back side of the chassis.
Nothing shown there on the parts list diagram.
THe power cord is supposed to be wired to the block that is shown on the parts list diagram.
Looks like they added a second block and wired the power cord to that one.
They also did some jerry rigging when they replaced the electrolitics.
Anyway, I replaced the double caps in both blocks and still have the slight distortion.
In fact I now have a squeal if I turn it all the way up on the volume.
THere are a couple caps I could still replace if I dig enough.
Seems to pick up lots of stations, just has a distortion problem.
Tested all tubes and replaced a couple with no luck.
Tried adjusting the alignment a little, but no luck.
Any suggestions from the experts?
Thanks and have a great weekend.
murf
Posts: 5,088
Threads: 270
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Just Radios has 0.015uF safety caps if you need them.
Posts: 668
Threads: 144
Joined: Jun 2011
City: Elko,MN.
Why safety caps?
In other words the .02 630 volt caps I put in, need to be replaced?
Could that be causing the squeal at high volume?
murf
Posts: 5,088
Threads: 270
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Here's the ABC's of safety caps found on the Just Radios site.
http://www.justradios.com/safetytips.html
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
No, no squeal from them.
Yes, either replace them or delete them.
Check the volume control. It can often have an open tap or intermittent causing these problems.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
